SU1387039A1 - Device for displaying data on television display screen - Google Patents

Abstract

The invention relates to automation, computing and television technology and can be used when displaying character-graphic information on the screens of television receivers. The purpose of the invention is to increase the speed of the device. The device contains a block of 1 memory, a generator of 2 characters, a shaper 3 of a video signal, a television receiver 4, a register 5, a controlled frequency divider 6, a counter 7 of image start shift pulses, a counter of 8 characters per line, a shaper of horizontal scanning, a divider 10 frequency , synchronizing generator 11, prohibition element 12, 13 clock pulse generator, 14 rows counter, vertical frame builder 15 with corresponding links. When registering in register 5 from a computer at the input 17 of the shift codes of a character, the type of which is determined by the character code arriving at input 16 ensures a smooth displacement of the character along the screen in the horizontal direction. 1 il. € (L

Description

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The invention relates to automation, computing and television technology and can be used when displaying character-graphic information on the screens of television receivers.

The purpose of the invention is to increase the speed of the device.

The drawing shows the block diagram of the device.

The device contains a block of 1 memory, a generator of 2 characters, a shaper 3 of a video signal, a television receiver 4, a register 5, a controlled frequency divider 6, a counter 7 of image start shift pulses, a counter of 8 characters per line, a shaper of horizontal scanning, a divider 10 frequency , the synchronous generator 11, the element 12 of the ban, the generator 13 clock pulses, the counter 14 lines and the imaging unit 15 frame scan.

In addition, the device has the first information input 16 (character codes) and the second information input 17 (data input from a computer).

The device works as follows.

From the input 16, character codes are written to memory block 1, from which, with the frequency received from the second output of the nine-line scanner, to the first input of memory block 1, depending on the number of displayed characters (if character information is displayed) in one line of text the television receiver 4 is fed to the third input of the generator of 2 characters, in which they are converted into CRT illumination pulses.

Signals strobe the issuance of pulses of illumination of the beam of a CRT generator 2 characters to the output of the imaging unit 3 video signals, are fed to the second input of the generator 2 characters from the first output of the imaging unit 9 horizontal scanning. The pulses determining the generator issuing 2 characters of a vertically-defined row of pulses illuminating the CRT of the decomposition matrix of the symbol arrive at the first input of the generator 2 characters from the first output of the frame scanner 15. Generator 3 of video signal functions as a summing pulse illumination beam CRT during direct television scanning stroke with the television sync signal which is supplied to the second input of the three video signal output from the "television sinhrosmos clock generator 11 and matching output function shaper 3 video signal from the television receiver input 4 by electrical parameters.

The shapers 9 and 15, respectively, of the line and frame sweep, are decoders of the counter states and form the pulse sequences that control the operation of the main memory unit 1 and the 2 character generator.

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Counters 8 and 14 produce, respectively, the primary sequences of digital scanning functions of horizontal and vertical image sampling.

The generator 13 generates the sampling frequency of the television line horizontally. The period of its frequency is equal in duration to the smallest element of character discretization horizontally. At the same time, the generator 13 generates the frequency necessary for the operation of the clock generator 11. It enters the input of the clock generator 1 from the second output of the clock generator 13. The pulses with the sampling frequency of character elements horizontally arrive at the second input of the counter 8 characters per line (which is its counting input) from the output of the prohibition element 12 during the forward stroke of the horizontal sweep of the television receiver 4. These pulses come to the second input of the prohibition element 12 from the first output of the generator 13. Gating of output mpulsov horizontally sampling the symbols of elements in the counting output of the counter 8 occurs

5 through the first input of the prohibition element 12, to which the pulses of the OIG come from the first output of the clock generator 11. The pulses of the OIG simultaneously arrive at the fourth input of the counter 8, gating for the time of appearance of the pulses of the ODS on it

0 output counter 8 binary code, which is installed on its installation first input. The initial setup, which is rewritten each time during the OTP and transmitted to the output of counter 8, forms counter 7, from which this

5 installation at the first input of the counter 8 characters.

An increase in the setpoint, which occurs with the arrival of each next pulse to the counting input of counter 7, causes

Q is a variable shift in the start of the display of symbols with respect to the decline of the pulses of GIS. The latter is visually perceived as the movement of the information line on the screen of receiver 4 from right to left, which corresponds to the natural reading of text from left to right.

The speed of movement of information is determined by the frequency received from the output of the frequency divider 10, the division factor of which is chosen such that when 0 is removed from its output frequency, the speed of text on the screen of the television receiver corresponds to the maximum of the frequency range and, accordingly, the speed of text on the screen calculated device. The pulses from the output of block 10 are fed to a controlled frequency divider 6, which is a software controlled frequency divider of the signals from the output of block 10.

On input 17 of data input from a computer, a code is received that controls the speed of movement of the text, which is fixed by register 5, which ensures synchronous operation of the device, and serves to interface the device with a computer. The setup code from the output of register 5 is fed to a controlled frequency amplifier b, which provides the necessary division factor, not necessarily a multiple of two, ensuring the passage of pulses corresponding to the speed code. The speed of text movement depends on the number of missed pulses: the greater the number of pulses, the greater the speed of text movement. The number of pulses missed in a series depends on the content of the corresponding code bits on the splint, where the logical zero bit corresponds to the missed pulse.

Thus, the invention makes it possible to increase the speed of the device by controlling the speed of text movement across the screen.

Claims (1)

Invention Formula Devices for displaying information on the screen of a television indicator containing a block of RAM, a character generator, a video signal conditioner, a counter of image start shift pulses, a character counter in a row, a horizontal scan driver, a frequency divider, a clock generator, a prohibition element, a clock generator, a line counter , vertical frame former, the first output of which is connected to the first control input of the character generator, the second control input of which is connected to the first output of the forms rovatel horizontal scanning, the second output of which is connected to a first control input of the 0 RAM, the second control input of which is connected to the second output of the vertical scanner, whose input is connected to the output of the row counter, whose counting input, the reset input of the character counter in the row and the first input of the prohibition element are connected to the first output of the synchronous generator, the second output of which is connected with the input of the frequency divider and the reset input of the row counter, the third output of the clock generator is connected to the synchronous input of the driver of the video signal, the output of which is connected to the video input of the television indicator An information input video signal shaper is connected to 5 by the output of a character generator, the address input of which is connected to the output of the RAM unit, the information input of which is the first information input of the device, the input of the line scanner is connected to the output 0 characters in the row, the counting input of which is connected to the output of the inhibit element, the second input of which is connected to the first output of the clock generator, the second output of which is connected to the input of the clock generator, the fourth output of which is connected to the control input of the characters counter in the row, whose information input connected to the output of the pulse counter of the beginning of the image, characterized in that, in order to improve the speed of the device, it contains a register and a controlled frequency divider, the output of which connected to the counting input of the pulse offset pulse counter, the output of the frequency divider is connected to the counting input of the controlled frequency divider, the control input of which is connected to the register output, whose information input is the second information input of the device.